package com.test.config;

import com.alibaba.csp.sentinel.adapter.gateway.sc.SentinelGatewayFilter;
import java.util.Collections;
import java.util.List;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.codec.ServerCodecConfigurer;
import org.springframework.web.reactive.result.view.ViewResolver;

/**
 * <p>
 * <code>GatewayConfiguration</code>
 * </p>
 * Description:
 *
 * @author jianzh5
 * @date 2020/1/18 16:35
 */
@Configuration
public class GatewayConfiguration {
    private final List<ViewResolver> viewResolvers;
    private final ServerCodecConfigurer serverCodecConfigurer;


    public GatewayConfiguration(ObjectProvider<List<ViewResolver>> viewResolversProvider,
                                ServerCodecConfigurer serverCodecConfigurer) {
        this.viewResolvers = viewResolversProvider.getIfAvailable(Collections::emptyList);
        this.serverCodecConfigurer = serverCodecConfigurer;
    }


    /**
     * 注入自定义网关异常
     */
    @Bean
    @Order(Ordered.HIGHEST_PRECEDENCE)
    public CustomGatewayBlockExceptionHandler customGatewayBlockExceptionHandler() {
        // Register the block exception handler for Spring Cloud Gateway.
        return new CustomGatewayBlockExceptionHandler(viewResolvers, serverCodecConfigurer);
    }


    @Bean
    @Order(-1)
    public GlobalFilter sentinelGatewayFilter() {
        return new SentinelGatewayFilter();
    }

}
